JPH09225673A - Laser machining method and laser machining head used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To physically treat and remove an oxide film, burning, edge at a cut part by jetting toward a work with mixing grinding powder in assist gas after laser machining is executed with using oxygen as assist gas. SOLUTION: By using a laser machining head 1 consisting of a machining head main body 3 arranged with an assist gas jetting hole 9 and a nozzle 5, by condensing a laser beam LB with a condensing lens 7, jetting assist gas and irradiating a work W on a work table 13 with laser beam, cutting is executed. Thereafter, assist gas is jetted at the same route with mixing a grinding powder in assist gas. At this time, the inner face of the nozzle 5 is preferably coated with a wear resistant material. Fired carbon is preferable as this wear resistant material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser processing method for laser processing a work and a laser processing head used in the method.

[0002]

2. Description of the Related Art Conventionally, a laser processing machine capable of performing free-form cutting on a work is heat energy processing and
When oxygen is used as the assist gas, the process uses oxidation heat. Moreover, the width of the work removed by the laser beam in the cutting path is narrow, and is about 0.1 to 0.3 mm.

[0003]

By the way, in the above-described laser processing method using oxygen as the assist gas, when the cut work is used for decoration, the oxide film or the scorching on the side surface of the cut portion must be removed. And it is very difficult to remove them.

The oxide film can be prevented by using an inert gas as an assist gas, but since the heat of oxidation cannot be used, there is a problem that the plate thickness that can be cut is greatly restricted, and the thick plate cannot be processed. In addition, it is difficult to deal with the burn.

An object of the present invention is to provide a laser processing method and a laser processing head used in the method, which can physically remove an oxide film, a burnt or an edge generated in a cut portion of a workpiece by physical processing. is there.

[0006]

In order to achieve the above object, the laser processing method of the present invention according to claim 1 performs laser processing by irradiating a workpiece to be processed with a laser beam from a laser processing head. After that, it is characterized in that the abrasive is mixed in the assist gas in the same path and is sprayed toward the work.

Therefore, when performing laser processing on a work, laser processing is performed by irradiating a laser beam from the laser processing head toward the work. After the laser processing is completed, the abrasive is mixed and injected into the assist gas in the same path, so that the oxide film and scorching generated on the cut surface of the workpiece are physically processed and removed by the abrasive.

The laser processing head of the present invention according to claim 2 is a laser processing head having a nozzle at the tip for irradiating a work to be processed with a laser beam, and the inner surface of the nozzle is made of a wear resistant material. It is characterized by being covered.

Therefore, since the inner surface of the nozzle provided at the tip of the laser processing head is covered with the wear resistant material, the inner surface of the nozzle can withstand the sprayed abrasive material and prevent deformation due to wear.

According to a third aspect of the present invention, there is provided a laser processing head according to the second aspect, wherein the wear-resistant material is calcined carbon.

Therefore, by using calcined carbon as the abrasion resistant material, the deformation due to abrasion of the inner surface of the nozzle can be further prevented.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, the laser processing head 1 is provided with a processing head main body 3 which is vertically movable.
A nozzle 5 is detachably attached to the tip of the processing head body 3. Inside the processing head body 3, there is provided a condenser lens 7 for condensing a laser beam LB oscillated from a laser oscillator (not shown) through a plurality of bend mirrors.

A jet hole 9 for jetting an assist gas such as oxygen mixed with an abrasive is formed in a part of the processing head body 3. The inner surface of the nozzle 5 is covered with a high heat and wear resistant material 11 such as calcined carbon.

With the above configuration, when performing laser processing on the work W placed and fixed on the work table 13, the laser beam LB oscillated by the laser oscillator passes through the plurality of bend mirrors and enters the processing head main body 3. After being condensed by the condensing lens 7 provided, it is irradiated from the nozzle 5 toward the work W. When the assist gas supply device (not shown) ejects an assist gas composed of oxygen from the ejection holes 9 formed in the processing head body 3 into the nozzle 5 together with the irradiation of the laser beam LB, the nozzle 5 ejects the workpiece W toward the workpiece W. Then, favorable laser processing (laser cutting) is performed by the laser beam LB and the assist gas.

After the processing is completed, when the assist gas mixed with the abrasive is sprayed from the nozzle 5 through the jetting hole 9 to the same cut path, the oxide film and the scorching in the narrow gap generated on the cut surface can be removed. it can. It is also possible to take an edge after finishing the processing.

Since the inner surface of the nozzle 5 is covered with a highly abrasive material 11 such as calcined carbon, even if the assist gas mixed with an abrasive is ejected into the nozzle 5, the inner surface of the nozzle 5 is not deformed due to wear. Can be prevented.

Therefore, the cut work W can have the same impact on the market as the clean cut work such that the oxide film, the burnt or the edge can be removed to open a sales channel for the processing of decorative parts.

The present invention is not limited to the above-described embodiment, but can be embodied in other forms by making appropriate changes. In the example of the present embodiment, a preferable example in which the inner surface of the nozzle 5 is covered with fired carbon as a wear resistant material has been described, but other wear resistant materials may be used.

[0020]

As can be understood from the examples of the embodiment as described above, according to the first aspect of the invention, when performing laser processing on a work, a laser beam is irradiated from the laser processing head toward the work. Then, laser processing is performed. By mixing and spraying the abrasive in the assist gas into the same path after the laser processing is completed, the oxide film, burnt or edge generated on the cut surface of the work can be physically treated and removed by the abrasive.

According to the second aspect of the present invention, since the inner surface of the nozzle provided at the tip of the laser processing head is covered with the wear resistant material, the inner surface of the nozzle withstands the abrasive material to be sprayed and wears. It is possible to prevent deformation due to.

According to the third aspect of the present invention, since the wear-resistant material is calcined carbon, it is possible to further prevent deformation of the inner surface of the nozzle due to wear.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view of a laser processing head that performs laser processing on a work according to an embodiment of the present invention.

[Explanation of symbols]

 1 Laser Processing Head 3 Processing Head Main Body 5 Nozzle 7 Condenser Lens 9 Jet Hole 11 Wear Resistant Material 13 Work Table LB Laser Beam

Claims (3)

[Claims] 1. A laser processing head irradiates a laser beam onto a work to be processed for laser processing, and then an abrasive is mixed in an assist gas in the same path and jetted toward the work. And laser processing method. 2. A laser processing head having a nozzle at a tip for irradiating a work to be processed with a laser beam, wherein the inner surface of the nozzle is covered with a wear resistant material. head. 3. The laser processing head according to claim 2, wherein the wear resistant material is calcined carbon.